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PDF TEA1065T Data sheet ( Hoja de datos )
| Número de pieza | TEA1065T | |
| Descripción | Versatile telephone transmission circuit with dialler interface | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1065
Versatile telephone transmission
circuit with dialler interface
Product specification
File under Integrated Circuits, IC03A
March 1994
1 page  
Philips Semiconductors
Versatile telephone transmission circuit with
dialler interface
Product specification
TEA1065
FUNCTIONAL DESCRIPTION
Supply: VCC, LN, SLPE, REG and STAB
The circuit and its peripherals are usually supplied from the
telephone line. The circuit develops its own supply voltage
at VCC (pin 21) and regulates its voltage drop between LN
and SLPE (pins 1 and 24). The internal supply requires a
decoupling capacitor between VCC and VEE (pin 16); the
internal voltage regulator has to be decoupled by a
capacitor from REG (pin 22) to VEE. The internal current
stabilizer is set by a 3.6 kΩ resistor connected between
STAB (pin 9) and VEE.
The TEA1065 can be set either in a DC voltage regulator
mode or in a DC current regulator mode. The DC mask can
be selected by connecting the appropriate external
components to the dedicated pins (VSI, REFI, DOC,
VBG).
When the DC current regulator mode is not required it can
be cancelled by connecting pin VSI to VEE; pins REFI,
VBG and DOC are left open-circuit.
Voltage regulator mode
The voltage regulator mode is achieved when the line
current is less than the current Iknee as illustrated in Fig.3.
With R13 = R14 = 30 kΩ, the current Iknee = 30 mA
(Ip = 0 mA).
This line current value will be reached when the voltage on
pin VSI (almost equal to the voltage on pin SLPE) exceeds
the voltage on pin REFI (equal to the voltage on pin VBG
divided by the resistor tap R13, R14). For other values of
R13 and R14, the Iknee current is given by the following
formula:
Iknee = ICC + IP + (VBG/R9) × {R14/(R14 + R13)}
− (R15/R9) × IO(VSI)
ICC is the current required by the circuit itself
(typ. 1.14 mA). IP is the current required by the peripheral
circuits connected between VCC and VEE. IO(VSI) is the
output current from pin VSI (typ. 2.5 µA).
The DC slope of the Vline/Iline curve is, in this mode,
determined by R9 (R9 = R9a + R9b) in series with the
rds of the external line current control transistor (see Fig.4;
rds = ∂VGS/∂ID at VGS = VDS).
Current regulator mode
The current regulator mode is achieved when the line
current is greater than Iknee. In this mode, the slope of the
Vline/Iline curve is approximately 1300 Ω with R9 = 20 Ω,
R16 = 1 MΩ, R13 = R14 = 30 kΩ. For other values of
these resistances, the slope value can be approximated by
the following formula:
R9 × {1 + R16 × (1/R13 + 1/R14)}
handbook, full pagewidth
line
current
MBA567
March 1994
Iknee
0
0
voltage
regulator
mode
current
regulator
mode
set
voltage
Fig.3 Voltage and current regulator mode.
5
5 Page 
Philips Semiconductors
Versatile telephone transmission circuit with
dialler interface
Product specification
TEA1065
Automatic gain control
Automatic compensation of line loss is obtained by connecting a resistor (R6) between AGC and VEE. The automatic gain
control varies the gain of the microphone amplifier and receiving amplifier in accordance with the DC line current (see
Fig.12). The control range is 5.9 dB; this corresponds to a line length of 3.5 km of twisted pair cable (see Fig.11). The
DTMF gain is not affected by this feature.
If automatic line loss compensation is not required the AGC pin can be left open-circuit, the amplifiers then give their
maximum gain.
handbook, full pagewidth
34.8 Ω 75 µH
13 nF
34.8 Ω
75 µH
75 µH
24.3 nF
34.8 Ω
24.3 nF
75 µH
34.8 Ω
MBA572
Fig.11 Typical 0.5 km line cell model used for automatic gain control optimization.
handbook, full pagewidth
1
∆Gv 0
(dB)
−1
R6 = ∞
MBA549
−3
−5
R6 = 86.6 kΩ 118 kΩ 147 kΩ
187 kΩ
−7
0 20 40 60 80
Iline (mA)
Fig.12 Variation of gain as a function of line current with R6 as a parameter; R9 = 20 Ω.
March 1994
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet TEA1065T.PDF ] | |
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